148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* Copyright (C) 2012 ARM Limited
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/vexpress.h>
|
|
|
|
#include <asm/system_misc.h>
|
|
|
|
static void vexpress_reset_do(struct device *dev, const char *what)
|
|
{
|
|
int err = -ENOENT;
|
|
struct regmap *reg = dev_get_drvdata(dev);
|
|
|
|
if (reg) {
|
|
err = regmap_write(reg, 0, 0);
|
|
if (!err)
|
|
mdelay(1000);
|
|
}
|
|
|
|
dev_emerg(dev, "Unable to %s (%d)\n", what, err);
|
|
}
|
|
|
|
static struct device *vexpress_power_off_device;
|
|
|
|
static void vexpress_power_off(void)
|
|
{
|
|
vexpress_reset_do(vexpress_power_off_device, "power off");
|
|
}
|
|
|
|
static struct device *vexpress_restart_device;
|
|
|
|
static void vexpress_restart(enum reboot_mode reboot_mode, const char *cmd)
|
|
{
|
|
vexpress_reset_do(vexpress_restart_device, "restart");
|
|
}
|
|
|
|
static ssize_t vexpress_reset_active_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", vexpress_restart_device == dev);
|
|
}
|
|
|
|
static ssize_t vexpress_reset_active_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
long value;
|
|
int err = kstrtol(buf, 0, &value);
|
|
|
|
if (!err && value)
|
|
vexpress_restart_device = dev;
|
|
|
|
return err ? err : count;
|
|
}
|
|
|
|
DEVICE_ATTR(active, S_IRUGO | S_IWUSR, vexpress_reset_active_show,
|
|
vexpress_reset_active_store);
|
|
|
|
|
|
enum vexpress_reset_func { FUNC_RESET, FUNC_SHUTDOWN, FUNC_REBOOT };
|
|
|
|
static struct of_device_id vexpress_reset_of_match[] = {
|
|
{
|
|
.compatible = "arm,vexpress-reset",
|
|
.data = (void *)FUNC_RESET,
|
|
}, {
|
|
.compatible = "arm,vexpress-shutdown",
|
|
.data = (void *)FUNC_SHUTDOWN
|
|
}, {
|
|
.compatible = "arm,vexpress-reboot",
|
|
.data = (void *)FUNC_REBOOT
|
|
},
|
|
{}
|
|
};
|
|
|
|
static int vexpress_reset_probe(struct platform_device *pdev)
|
|
{
|
|
enum vexpress_reset_func func;
|
|
const struct of_device_id *match =
|
|
of_match_device(vexpress_reset_of_match, &pdev->dev);
|
|
struct regmap *regmap;
|
|
|
|
if (match)
|
|
func = (enum vexpress_reset_func)match->data;
|
|
else
|
|
func = pdev->id_entry->driver_data;
|
|
|
|
regmap = devm_regmap_init_vexpress_config(&pdev->dev);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
dev_set_drvdata(&pdev->dev, regmap);
|
|
|
|
switch (func) {
|
|
case FUNC_SHUTDOWN:
|
|
vexpress_power_off_device = &pdev->dev;
|
|
pm_power_off = vexpress_power_off;
|
|
break;
|
|
case FUNC_RESET:
|
|
if (!vexpress_restart_device)
|
|
vexpress_restart_device = &pdev->dev;
|
|
arm_pm_restart = vexpress_restart;
|
|
device_create_file(&pdev->dev, &dev_attr_active);
|
|
break;
|
|
case FUNC_REBOOT:
|
|
vexpress_restart_device = &pdev->dev;
|
|
arm_pm_restart = vexpress_restart;
|
|
device_create_file(&pdev->dev, &dev_attr_active);
|
|
break;
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id vexpress_reset_id_table[] = {
|
|
{ .name = "vexpress-reset", .driver_data = FUNC_RESET, },
|
|
{ .name = "vexpress-shutdown", .driver_data = FUNC_SHUTDOWN, },
|
|
{ .name = "vexpress-reboot", .driver_data = FUNC_REBOOT, },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver vexpress_reset_driver = {
|
|
.probe = vexpress_reset_probe,
|
|
.driver = {
|
|
.name = "vexpress-reset",
|
|
.of_match_table = vexpress_reset_of_match,
|
|
},
|
|
.id_table = vexpress_reset_id_table,
|
|
};
|
|
|
|
static int __init vexpress_reset_init(void)
|
|
{
|
|
return platform_driver_register(&vexpress_reset_driver);
|
|
}
|
|
device_initcall(vexpress_reset_init);
|